None of this means that you have to be on a specific platform. GitHub as default/mandatory is a single point of failure for the entire tech industry.
For an example of another language that avoids being entirely coupled into Github, Go has it's real code hosting and CI interaction on a Gerrit instance, with some sync back and forth to GitHub for a few items.
The CI pain and operational blindness mentioned in the Zig post is entirely real.
Yeah but marketing matters for Zig because it's still struggling to get significant mindshare.
Zig needs to behave more mainstream rather than less and technical gripes about the source hosting platform should not matter more than marketing.